In this video, we have a MacBook that shows a folder with question mark on the screen. And, when accessing disk utility, it wouldn't detect the hard drive at all. Tried multiple hard drive, of which none of them were detected. So, the next stage of diagnostic was to replace the hard disk ribbon cable connecting it to the motherboard. That fix the problem and the hard drive started detecting again.

TOOLS USED:
00 philip screw driver: https://amzn.to/3cJxPyY
Prying Opening Repair Tool Kit for Laptop: https://amzn.to/2zrjh8U
Wowstick 1F Electric Screwdriver Cordless Chargeable: https://amzn.to/2S8ikc1
Thermal Compound Paste, Compound CPU for All Coolers: https://amzn.to/356MAJB

Disclaimer: The steps and procedures shown in the videos are for educational purpose only.